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ora-12154 [message #283420] Tue, 27 November 2007 01:58 Go to next message
gaju_3112
Messages: 28
Registered: September 2007
Location: India
Junior Member

I am getting Ora-12154 error saying 'TNS: Could not resolve Service Name'. Please provide me the step by step procedure to resolve this error. Please be descriptive considering I am beginer in Oracle world.
Re: ora-12154 [message #283421 is a reply to message #283420] Tue, 27 November 2007 02:00 Go to previous messageGo to next message
Arju
Messages: 1554
Registered: June 2007
Location: Dhaka,Bangladesh. Mobile:...
Senior Member

show the status of listener.

lsnrctl status

Re: ora-12154 [message #283422 is a reply to message #283420] Tue, 27 November 2007 02:02 Go to previous messageGo to next message
Mohammad Taj
Messages: 2412
Registered: September 2006
Location: Dubai, UAE
Senior Member

You should check your TNSNAMES.ORA file.
I suspect you connect like "username/password@tnsentry
now check your tnsentry is exists in TNSNAMES.ORA file.
Re: ora-12154 [message #283424 is a reply to message #283420] Tue, 27 November 2007 02:09 Go to previous messageGo to next message
Arju
Messages: 1554
Registered: June 2007
Location: Dhaka,Bangladesh. Mobile:...
Senior Member

In addition to Mohammad Taj, at first check by invoking 'lsnrctl status' in the database to which you are connecting and see the service name status of the intended TNS entry(which is in tnsnames.ora in your local database service_name).
Re: ora-12154 [message #283433 is a reply to message #283420] Tue, 27 November 2007 02:22 Go to previous messageGo to next message
Michel Cadot
Messages: 64108
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator
ORA-12154: TNS:could not resolve the connect identifier specified
 *Cause:  A connection to a database or other service was requested using
 a connect identifier, and the connect identifier specified could not
 be resolved into a connect descriptor using one of the naming methods
 configured. For example, if the type of connect identifier used was a
 net service name then the net service name could not be found in a
 naming method repository, or the repository could not be
 located or reached.
 *Action:
   - If you are using local naming (TNSNAMES.ORA file):
      - Make sure that "TNSNAMES" is listed as one of the values of the
        NAMES.DIRECTORY_PATH parameter in the Oracle Net profile
        (SQLNET.ORA)
      - Verify that a TNSNAMES.ORA file exists and is in the proper
        directory and is accessible.
      - Check that the net service name used as the connect identifier
        exists in the TNSNAMES.ORA file.
      - Make sure there are no syntax errors anywhere in the TNSNAMES.ORA
        file.  Look for unmatched parentheses or stray characters. Errors
        in a TNSNAMES.ORA file may make it unusable.
   - If you are using directory naming:
      - Verify that "LDAP" is listed as one of the values of the
        NAMES.DIRETORY_PATH parameter in the Oracle Net profile
        (SQLNET.ORA).
      - Verify that the LDAP directory server is up and that it is
        accessible.
      - Verify that the net service name or database name used as the
        connect identifier is configured in the directory.
      - Verify that the default context being used is correct by
        specifying a fully qualified net service name or a full LDAP DN
        as the connect identifier
   - If you are using easy connect naming:
      - Verify that "EZCONNECT" is listed as one of the values of the
        NAMES.DIRETORY_PATH parameter in the Oracle Net profile
        (SQLNET.ORA).
      - Make sure the host, port and service name specified
        are correct.
      - Try enclosing the connect identifier in quote marks.

   See the Oracle Net Services Administrators Guide or the Oracle
   operating system specific guide for more information on naming.

Regards
Michel
Re: ora-12154 [message #283459 is a reply to message #283420] Tue, 27 November 2007 03:52 Go to previous messageGo to next message
gaju_3112
Messages: 28
Registered: September 2007
Location: India
Junior Member

Please give me step by step procedure. As I have said, I am beginer and don't know even location of *.ora file u r specifying. Where and how to check it?
Re: ora-12154 [message #283460 is a reply to message #283459] Tue, 27 November 2007 04:07 Go to previous message
Michel Cadot
Messages: 64108
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator
Net Services Reference

Regards
Michel
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